CocosGameFrameWork/assets/Script/Game/MyApp/GameScene/LifeBar.ts

import { _decorator, Component, ProgressBar } from 'cc';
const { ccclass, property } = _decorator;

@ccclass('LifeBar')
export class LifeBar extends Component {
    _curHp: number = null;
    _totalHp: number = null;
    private _progressBar: ProgressBar = null;
    protected onLoad(): void {
        this._progressBar = this.node.getChildByName("ProgressBar").getComponent(ProgressBar);
    }
    start() {
        this._progressBar.progress = this._curHp / this._totalHp;
    }
    updateProgressBar(hp: number) {
        this._curHp = hp;
        this._progressBar.progress = this._curHp / this._totalHp;
    }
}